No, it's not a UO-8. Usually it's a cheap Pug being sold as a good one, not vice versa!

Since it has a Stronglight 93 crank, I'd guess it's a PR10 or PX10LE. 1976 perhaps? Good bike and worth the asking price either way.

Despite having owned two PX10's, I'm not a Peugeot expert by a long shot. Hopefully someone who knows the 70s models better will chime in.